Hello!
My page was written in valid HTML 4.01 until I cutted and pasted the link
you provided to the validator. At the following check I obtained this answer:
Below are the results of attempting to parse this document with an SGML
parser.
Line 189, column 84:
...
/check?uri=http%3A%2F%2Fwww.uniroma1.it%2FECIS%2F&doctype=Inline"><img ...
^
Error: unknown entity "doctype" (explanation...)
So, as Juvenal would say, "who validates the validators?"...
Thank you.
AB